Probing triaxiality beyond the proton drip line: Spectroscopy of <math xmlns="http://www.w3.org/1998/Math/MathML"><mmultiscripts><mi>Tm</mi><mprescripts></mprescripts><none></none><mn>147</mn></mmultiscripts></math>

K. Auranen; P. Siwach; P. Arumugam; A. D. Briscoe; L. S. Ferreira; T. Grahn; P. T. Greenlees; A. Herzáň; A. Illana; D. T. Joss; H. Joukainen; R. Julin; H. Jutila; M. Leino; J. Louko; M. Luoma; E. Maglione; J. Ojala; R. D. Page; J. Pakarinen; P. Rahkila; J. Romero; P. Ruotsalainen; M. Sandzelius; J. Sarén; A. Tolosa-Delgado; J. Uusitalo; G. Zimba

doi:10.1103/PhysRevC.108.L011303

Letter

Probing triaxiality beyond the proton drip line: Spectroscopy of ${}^{147}{Tm}$

K. Auranen ^1,*, P. Siwach², P. Arumugam³, A. D. Briscoe¹, L. S. Ferreira⁴, T. Grahn¹, P. T. Greenlees¹, A. Herzáň⁵, A. Illana^1,† et al.

D. T. Joss⁶, H. Joukainen¹, R. Julin¹, H. Jutila¹, M. Leino¹, J. Louko¹, M. Luoma¹, E. Maglione⁴, J. Ojala^1,‡, R. D. Page⁶, J. Pakarinen¹, P. Rahkila¹, J. Romero^1,6, P. Ruotsalainen¹, M. Sandzelius¹, J. Sarén¹, A. Tolosa-Delgado¹, J. Uusitalo^1,6, and G. Zimba¹

¹Accelerator Laboratory, Department of Physics, University of Jyväskylä, FI-40014 Jyväskylä, Finland
²Department of Physics, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA
³Department of Physics, Indian Institute of Technology Roorkee, Roorkee 247667, India
⁴Centro de Física e Engenharia de Materiais Avançados CeFEMA, Instituto Superior Técnico, Universidade de Lisboa, Avenida Rovisco Pais, P1049-001 Lisbon, Portugal
⁵Institute of Physics, Slovak Academy of Sciences, SK-84511 Bratislava, Slovakia
⁶Department of Physics, Oliver Lodge Laboratory, University of Liverpool, Liverpool L69 7ZE, United Kingdom

^*kalle.e.k.auranen@jyu.fi
^†Present address: Departamento de Estructura de la Materia, Física Térmica y Electrónica and IPARCOS, Universidad Complutense de Madrid, E-28040 Madrid, Spain.
^‡Present address: Department of Physics, Oliver Lodge Laboratory, University of Liverpool, Liverpool L69 7ZE, United Kingdom.

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Phys. Rev. C 108, L011303 – Published 11 July, 2023

DOI: https://doi.org/10.1103/PhysRevC.108.L011303

Abstract

Two triaxial states of the proton-decaying nucleus ${}^{147}{Tm}$ were studied via a comparison of experimental data to results obtained through nonadiabatic quasiparticle calculations. The experimental data were collected in a recoil-decay tagging study using the vacuum-mode recoil separator MARA coupled with the JUROGAM3 $γ$ -ray spectrometer. The previously proposed level scheme above the triaxial $11 / 2^{-}$ $(π h_{11 / 2})$ ground state was confirmed, and the level structure was expanded to cover the states above the weakly populated proton-emitting $5 / 2^{+}$ $(π d_{5 / 2})$ isomeric state. It was found that the isomeric state is also triaxial, and possibly more deformed than the ground state.

Physical Review C

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Probing triaxiality beyond the proton drip line: Spectroscopy of ${}^{147}{Tm}$

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Probing triaxiality beyond the proton drip line: Spectroscopy of Tm147

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Probing triaxiality beyond the proton drip line: Spectroscopy of ${}^{147}{Tm}$